<template xmlns="http://www.w3.org/1999/html">
  <div>
    <!--查询表单-->
    <el-form :inline="true" class="demo-form-inline">
      <!-- 所属分类:级联下拉列表 -->
      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select
          v-model="searchObj.subjectParentId" placeholder="请选择" @change="subjectLevelOneChanged"
        >
          <el-option
            v-for="subject in subjectNestedList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
        <!-- 二级分类 -->
        <el-select v-model="searchObj.subjectId" placeholder="请选择">
          <el-option
            v-for="subject in subSubjectList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
      </el-form-item>
      <!-- 标题 -->
      <el-form-item>
        <el-input v-model="searchObj.title" placeholder="课程标题"/>
      </el-form-item>
      <!-- 讲师 -->
      <el-form-item>
        <el-select v-model="searchObj.teacherId" placeholder="请选择讲师">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"
          />
        </el-select>
      </el-form-item>
      <el-button type="primary" icon="el-icon-search" @click="getList()">查 询</el-button>
      <el-button type="default" @click="resetData()">清 空</el-button>
    </el-form>


    <!-- 表格 -->
    <el-table v-loading="listLoading" :data="list" element-loading-text="数据加载中" border fit highlight-current-row
              row-class-name="myClassList"
    >
      <el-table-column
        label="序号"
        width="70"
        align="center"
      >
        <template slot-scope="scope">
          {{ (page - 1) * limit + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column label="讲师名称" align="center">
        <!--  <template slot-scope="scope" @change="getTeacherNameById()">-->
        <!--    {{ scope.row.teacherId}}-->
        <!--  </template>-->
        <template v-slot="scope">
          {{ TeacherName(scope.row.teacherId) }}
        </template>
      </el-table-column>

      <el-table-column label="课程信息" width="280" align="center">
        <template slot-scope="scope">
          <div class="info">
            <!--<div class="pic">-->
            <!--  &lt;!&ndash;<img :src="scope.row.cover" width="150px">&ndash;&gt;-->
            <!--  &lt;!&ndash;alt="scope.row.title"&ndash;&gt;-->
            <!--  &lt;!&ndash;<p>{{ scope.row.teacherId }}</p>&ndash;&gt;-->
            <!--</div>-->
            <div class="title">
              <a href="#">{{ scope.row.title }}</a>
              <p>{{ scope.row.lessonNum }}&nbsp;课时 </p></div>
          </div>
        </template>
      </el-table-column>
      <el-table-column label="创建时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtCreate.substr(0, 10) }}
        </template>
      </el-table-column>
      <el-table-column label="发布时间" align="center">
        <template slot-scope="scope">
          {{ scope.row.gmtModified.substr(0, 10) }}
        </template>
      </el-table-column>
      <el-table-column label="价格" width="100" align="center">
        <template slot-scope="scope">
          {{ Number(scope.row.price) === 0 ? '免费' : '¥' + scope.row.price.toFixed(2) }}
        </template>
      </el-table-column>
      <el-table-column prop="buyCount" label="付费学员" width="100" align="center"
      >
        <template slot-scope="scope">
          {{ scope.row.buyCount }} 人
        </template>
      </el-table-column>
      <el-table-column label="操作" width="150" align="center">
        <template slot-scope="scope">
          <!--<router-link :to="'/course/info/'+scope.row.id">-->
          <el-button type="text" size="mini" icon="el-icon-edit" @click="editCourseInfo(scope.row.id)">编辑课程信息
          </el-button>
          <!--</router-link>-->
          <!--<router-link :to="'/edu/course/chapter/'+scope.row.id">-->
          <el-button type="text" size="mini" icon="el-icon-edit" @click="editChapterInfo(scope.row.id)">编辑课程大纲
          </el-button>
          <!--</router-link>-->
          <el-button type="text" size="mini" icon="el-icon-delete" @click="deleteCourse(scope.row.id)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页 -->
    <el-pagination
      :current-page=" page
          "
      :page-size="limit"
      :total="total"
      style="padding: 30px 0; text-align: center;"
      layout="total, prev, pager, next, jumper"
      @current-change="getList"
    />
  </div>
</template>

<script>
import course from '@/api/edu/course'
import subject from '@/api/edu/subject'
import teacher from '@/api/edu/teacher'

export default {
  name: 'List',
  computed: {
    TeacherName() {
      return (teacherId) => {
        for (let item of this.teacherList) {
          if (item.id === teacherId) {
            return item.name
          }
        }
      }
    }
  },
  data() {
    return {
      listLoading: true, // 是否显示loading信息
      list: null, // 数据列表
      total: 0, // 总记录数
      page: 1, // 页码
      limit: 10, // 每页记录数
      searchObj: { // 查询条件
        subjectParentId: '',
        subjectId: '',
        title: '',
        teacherId: '',
        teacherName: '水电费时候'
      },

      teacherList: [], // 讲师列表
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [] // 二级分类列表,
    }
  },
  created() {
    this.getList()
    this.getSubjectNestedList()
    this.getTeacherList()
  },
  methods: {
    // 分页获取课程信息
    getList(page = 1) {
      // console.log(page)
      this.page = page
      course.pageCourseCondition(this.searchObj, this.page, this.limit)
        .then(response => {
          this.list = response.data.list
          // console.log(this.list)
          // this.list.forEach( item => {
          //   this.getTeacherNameById(item.teacherId)
          // })
          this.total = response.data.total
          // console.log(this.list)
          this.listLoading = false
        })
    },
    // 获取一级分类列表
    getSubjectNestedList() {
      subject.getSubjectList()
        .then(res => {
          // console.log(res.data)
          this.subjectNestedList = res.data.list
          // console.log(this.subjectNestedList)
        })
    },
    // 获取二级列表
    // 根据 subjectParentId 找 二级列表
    getSubjectList(subjectParentId) {
      this.subjectNestedList.forEach(item => {
        if (item.id === subjectParentId) {
          this.subSubjectList = item.children
          this.searchObj.subjectId = ''
        }
      })
    },
    subjectLevelOneChanged(subjectParentId) {

      this.getSubjectList(subjectParentId)
    },
    // 获得讲师列表
    getTeacherList() {
      teacher.selectAll()
        .then(res => {
          this.teacherList = res.data.items
          // console.log(this.teacherList)
        })
    },
    // 根据teacherId查找讲师姓名
    getTeacherNameById(teacherId) {
      console.log(teacherId)
      teacher.selectTeacherById(teacherId)
        .then(res => {
          // console.log(res.data.teacher.name)
          console.log(res)
        })
    },
    // 清空
    resetData() {
      this.searchObj = {}
    },
    // 点击编辑课程信息
    editCourseInfo(courseId) {
      // console.log(courseId)
      this.$router.push({ path: '/course/info', query: { courseId: courseId } })
    },
    //点击编辑课程大纲信息
    editChapterInfo(courseId) {
      this.$router.push({ path: '/course/chapter', query: { courseId: courseId } })
    },
    //点击删除课程
    deleteCourse(courseId) {
      course.deleteCourseByCourseId(courseId)
        .then(res => {
          if (res.code === 20000) {
            this.$message.success('删除课程成功～')
            this.getList()
          }
        })
        .catch(() => {
          this.$message.error('删除课程失败！')
        })
    }
  }
}
</script>

<style lang="less" scoped>
.myClassList .info {
  width: 450px;
  overflow: hidden;
}

.myClassList .info .pic {
  width: 150px;
  height: 90px;
  overflow: hidden;
  float: left;
}

.myClassList .info .pic a {
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

.myClassList .info .pic img {
  display: block;
  width: 100%;
}

.myClassList td .info .title {
  width: 280px;
  //float: right;
  height: 90px;
}

.myClassList td .info .title a {
  display: block;
  height: 48px;
  line-height: 24px;
  overflow: hidden;
  color: #00baf2;
  margin-bottom: 12px;
}

.myClassList td .info .title p {
  line-height: 20px;
  margin-top: 5px;
  color: #818181;
}

.demo-form-inline {
  margin-top: 20px;
  margin-left: 10px;
}
</style>
